873results about "Semiconductor lamp usage" patented technology

The invention discloses an LED screen surface damage detection method based on machine vision, and belongs to the technical field of machine vision recognized.The LED screen surface damage detection method based on machine vision comprises the following specific steps that firstly, a light source device is arranged, a flexible OLED light source module with the adjustable angle is used and installed around an LED screen, and the flexible OLED light source module with the adjustable angle is arranged around the LED screen; it is ensured that a light source can be evenly adjusted within the range of 0-180 degrees, the angle of the light source is based on the normal of a screen, and five angles including 0 degree, 45 degrees, 90 degrees, 135 degrees and 180 degrees are preset through an embedded controller; and 2, image acquisition control. Through a multi-angle illumination strategy (0-180-degree dynamic adjustment), the problem of missing detection caused by reflection angle difference of defects under a traditional single light source is solved, dynamic gray anomaly analysis is combined with DBSCAN clustering, real defects and environmental noise are effectively distinguished, simultaneous processing and fusion of multi-light-source angle images are supported, and the method is suitable for large-scale popularization and application. And the time accumulation problem of traditional serial detection is avoided.

Provided is a display panel. The display panel includes: a substrate; and a plurality of pixels on the substrate, wherein at least one of the plurality of pixels includes a plurality of sets of sub-pixels, at least one set of the plurality of sets of sub-pixels including a plurality of sub-pixels of a same color; wherein each of the plurality of sub-pixels includes: a drive circuit, coupled to a first control line, a data line, a first power line, and a first node; a compensation circuit, coupled to a second control line, a sensing line, and the first node; a light-emitting element, coupled to the first node and a second power line; and a shielding circuit, connected in series to any light-emitting channel.

The present invention relates to a protection circuit for protecting a load, the protection circuit comprising: an input node adapted to be couplable to an SMPS, a bleeder coupled between the input node and a return node, a first output node adapted to be coupled to the input node and a load, a second output node adapted to be coupled to the load, the second output node being couplable between the first output node and the second output node, an impedance coupled between the second output node and the return node, a switch coupled in parallel with the impedance, and a controller adapted to control the switch and the bleeder, the controller adapted to activate the bleeder and open the switch when a voltage across the impedance is above a threshold, and the controller adapted to deactivate the bleeder and close the switch when a voltage across the impedance is below the threshold.

The invention relates to a low-current LED output driving circuit with low cost and a diagnosis function, which comprises a second NPN triode, a first PNP triode, a first diode D1 and a first resistor R1, the positive electrode of the first diode D1 is connected with the positive electrode of a power supply, and the positive electrode and the negative electrode of the first diode D1 are connected with the emitting electrode of the first PNP triode; the first resistor R1 is connected in series between the collector electrode of the first PNP triode and the output port, the base electrode of the second NPN triode is connected with the MCU control port, the collector electrode of the second NPN triode is connected with the base electrode of the first PNP triode, the emitter electrode of the second NPN triode is grounded, and the other end of the first resistor R1 is connected with the LED output port. Compared with an intelligent power chip for driving the LED, the low-current LED output driving circuit with the low cost and the diagnosis function has the obvious cost advantage, has the function of preventing reverse connection of a power supply and the function of limiting current during short circuit, can meet the requirement of a vehicle gauge electrical load test, and is achieved at low cost.

An LED driving apparatus, a microcontroller, and a control method for an LED module are provided. The LED driving apparatus includes a power supply module, a switch module, and a control module. The power supply module is configured to supply power to the LED module, in which the power supply module determines whether to trigger an overcurrent protection based on whether an output current exceeds a threshold current. The control module is configured to receive an overcurrent detection signal to control a conduction state of the switch module, so as to affect the current amount of the LED module. When the overcurrent detection signal indicates the output current exceeds the threshold current, the control module outputs a first control signal based on the overcurrent detection signal to control the switch module, to prevent the overcurrent protection from being triggered.

The application provides a synergic dynamic lighting method and its adjustable light direct current incandescent lamp, relates to the field of vision and lighting, and aims to ensure that light is uniform and dynamic in the field of vision; the color temperature is strictly imitated candlelight; the core is direct current adjustable light incandescent lamp technology; and the light in the field of vision is mostly non-uniform and static in the present night desktop lighting, and the light quality is never as good as direct current incandescent lamp; this easily leads to eye accommodation laxity and induces axial myopia; the application mainly comprises two direct current incandescent lamp platforms, one of which illuminates a book, and the other of which illuminates a white wall in front of the eyes; the light intensity of each is adjustable to ensure the uniformity of light in the field of vision, so that the fovea and peripheral rod cells of the retina are stimulated at the same time; the two lamps can also realize the synchronous adjustment of illumination according to the program, thereby guiding the dynamic focusing of the eyes and realizing dynamic lighting; the dynamic also reflects the low color temperature mammal lighting imitating candlelight according to the biological clock and the anti-alzheimer's lighting with 40Hz deep frequency flash.

A visible light sensor may be configured to sense environmental characteristics of a space using an image of the space. The visible light sensor may be controlled in one or more modes, including a daylight glare sensor mode, a daylighting sensor mode, a color sensor mode, and / or an occupancy / vacancy sensor mode. In the daylight glare sensor mode, the visible light sensor may be configured to decrease or eliminate glare within a space. In the daylighting sensor mode and the color sensor mode, the visible light sensor may be configured to provide a preferred amount of light and color temperature, respectively, within the space. In the occupancy / vacancy sensor mode, the visible light sensor may be configured to detect an occupancy / vacancy condition within the space and adjust one or more control devices according to the occupation or vacancy of the space. The visible light sensor may be configured to protect the privacy of users within the space via software, a removable module, and / or a special sensor.

To provide a highly reliable light-emitting device which includes an organic EL element and is lightweight.SOLUTION: There is provided a light-emitting device including: a first organic resin layer; a first glass layer which is over the first organic resin layer and in contact with one face of the first organic resin layer; a second glass layer over a light-emitting element; and a second organic resin layer which is over the second glass layer and in contact with one face of the second glass layer. The first organic resin layer and the first glass layer each have a property of transmitting visible light. The thickness of the first glass layer and the thickness of the second glass layer are independently greater than or equal to 25 μm and less than or equal to 100 μm. The light-emitting element includes, from a first glass layer side, a first electrode having a property of transmitting visible light, a layer containing a light-emitting organic compound, and a second electrode.SELECTED DRAWING: Figure 1

Solid state transducers with state detection, and associated systems and methods are disclosed. A solid state transducer system may include a support substrate that carries a solid state emitter and a state device. The solid state emitter and the state device may be stacked along a common axis. Further, the state device may be positioned to detect a state of the solid state emitter and / or an electrical path of which the solid state emitter forms a part. The solid state emitter may include a first semiconductor component, a second semiconductor component, and an active region between the first and second semiconductor components. The state device may include a state-sensing component having a composition different than that of the active region and the first and second semiconductor components. In some embodiments, the state-sensing component may include an electrostatic discharge protection device, a thermal sensor, a photosensor, or a combination thereof.

System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current regulation circuit coupled to a cathode of one or more light emitting diodes. The one or more light emitting diodes include the cathode and an anode configured to receive a rectified voltage. Additionally, the system includes a control circuit coupled to the cathode of the one or more light emitting diodes. The control circuit is configured to receive a first voltage from the cathode of the one or more light emitting diodes, compare a second voltage and a threshold voltage, and generate a control signal based at least in part on the second voltage and the threshold voltage. The second voltage indicates a magnitude of the first voltage.

The invention discloses a dual-optical-path keyboard with a silica gel elastic piece capable of shielding light. The dual-optical-path keyboard comprises the silica gel elastic piece and an FPC, and a plurality of chips are arranged on the FPC. And the chip is one of a full color control chip, a full load color control chip, a confluence color control chip, a load color control chip and a fantasy color control chip. The light-sensitive element is located under the silica gel elastic piece, the silica gel elastic piece is made of a light-transmitting color material and a light-shading color material, the GRB in the chip is an emission light source, one path of the GRB directly provides illumination for a key cap character, the other path of the GRB directly penetrates through the silica gel elastic piece to provide the emission light source for the light-sensitive element under the silica gel elastic piece, and one light source has two purposes. The invention provides the optical switch keyboard with serial-parallel hot standby, the communication circuit is simple, the reliability is high, a single single-sided FPC (Flexible Printed Circuit) can realize full-key no-impact and GRB indication, a keyboard MCU (Microprogrammed Control Unit) can communicate with the keyboard through a maximum 5PIN electrical network, and the optical switch keyboard can be widely applied to notebook computer production.

The utility model discloses an OLED device optical life test system, comprising a test cabinet, an industrial computer, a fixture drawer, an electric signal reading module and a UPS uninterruptible power supply. The test cabinet is a rectangular vertical cabinet, the top of the test cabinet is provided with an industrial computer, the electric signal reading module and the UPS uninterruptible power supply are fixedly arranged in the test cabinet, a plurality of fixture drawers are arranged on the side panel of the test cabinet, the plurality of fixture drawers are arranged in an array, the fixture drawers can be independently pulled out and operated, a fixture is fixedly installed in each fixture drawer, the fixture is a flip cover structure, an OLED workpiece to be tested is placed in the fixture, the OLED workpiece can be enclosed in the fixture after the fixture is closed, so that the OLED workpiece is in a darkroom environment, a silicon photodiode probe is arranged in the fixture, and during testing, the silicon photodiode probe can read the optical signal of the OLED workpiece, and convert the optical signal into an electrical signal for external output; the utility model can perform batch detection on OLED devices, does not need to set a darkroom environment, has no interference in the detection process, and has high detection efficiency.

A lamp driver has a transformer, a primary side circuit and a secondary side circuit. The primary side circuit comprises a half bridge circuit and a sensor circuit for measuring a conduction time or switching frequency of one of the transistors of the half bridge circuit. An estimate is provided of the output voltage from the measured conduction time.

The invention provides a self-adaptive ripple suppression circuit based on an MOSFET, and relates to the technical field of electronic circuits. The circuit comprises an input alternating current end EMC filtering surge protection circuit, a rectification circuit, an absorption protection filtering circuit, a clamping absorption circuit, a detection protection circuit, a control circuit, a power follow current circuit, an output filtering circuit, a stroboflash removing circuit and an LED load circuit which are connected in sequence. Under the condition that the MOSFET self-adaptive ripple suppression circuit is in a working state, voltage at the two ends of the sampling resistor is fed back to a grid electrode and a source electrode of the MOS tube, on-resistance of the MOS tube is adjusted through change of the sampling voltage on the basis of the characteristic that the MOS tube works in a variable resistance area, and output current ripples are dynamically suppressed. The circuit has excellent adaptive capacity, can dynamically suppress output current ripples in a wide load range through a simple simulation negative feedback loop, and is quick in response.

A driving circuit is configured to drive a light-emitting unit to emit light, and the driving circuit includes: a voltage regulation circuit, configured to regulate a driving voltage of the light-emitting unit according to a voltage regulation signal; and a processing chip, configured to provide the voltage regulation signal to the voltage regulation circuit to reduce a difference between a reference current and a driving current of the light-emitting unit under a turned-on state.

A portable lighting device control module configured to intuitively adjust lighting operations of a portable lighting device by interpreting real-time user gestures and external conditions of the portable lighting device to modify lighting operations in response thereto. The control module installed within a portable lighting device may be configured to permit automatic dimming of front-end LEDs, enable a low power standby mode in absence of motion being detected, automatic mode adjustments in response to low battery determination, adjustment to lantern mode when a bump gesture is detected, continuous alternation between modes within lantern mode by detecting subsequent bump gestures, exiting lantern mode by detecting orientation, locking the lighting operation to a specific mode by determining orienting as either upwards or downwards, switching between modes by performing twist and return gestures, switching between modes by performing whip gestures, instantaneously dimming the light intensity by twisting the portable lighting device.

A controllable lighting device may utilize a controllable impedance circuit to conduct a load current through an LED light source. The controllable impedance circuit may be coupled in series with a first switching device, which may be rendered conductive and non-conductive via a pulse-width modulated signal to adjust an average magnitude of the load current. The controllable lighting device may further comprise a control loop circuit that includes a second switching device. The second switching device may be rendered conductive and non-conductive in coordination with the first switching device to control when a feedback signal is provided to the control loop circuit and used to control the LED light source. The control loop circuit may be characterized by a time constant that is significantly greater than an operating period of the load current.

A lighting device is disclosed. The example lighting device includes a printed circuit board. First and second LED circuits and respective first and second driver circuit are mounted on the printed circuit board. The first LED circuit is configured to emit a first color temperature of white light when receiving power from the first driver circuit and the second LED circuit is configured to emit a second color temperature of white light when receiving the power from the second driver circuit. The second color temperature of white light emitted from the second LED circuit is different than the first color temperature of white light emitted from the first LED circuit.

An LED lamp arrangement (100) for replacing a fluorescent lamp in a luminaire having an electronic ballast. The LED lamp arrangement (100) has a plurality of LEDs (101, 102, 103), an SVM reduction circuit (110) having an energy storage device connected across the plurality of LEDs (101, 102, 103), and a measurement and control circuit (120) adapted to measure the current drawn from the electronic ballast and generate an output to the SVM reduction circuit (110). Based on said output, the measurement and control circuit (130) is configured to activate the SVM reduction circuit (110) when the current drawn from the electronic ballast exceeds a threshold, and deactivate the SVM reduction circuit (110) when the current drawn from the electronic ballast does not exceed the threshold.

System and method for controlling one or more light emitting diodes. For example, the system includes: a power supply controller configured to receive a cathode voltage from a cathode of a diode, the diode including an anode configured to receive a rectified voltage generated by a rectifying bridge, the power supply controller being further configured to generate a first signal based at least in part on the cathode voltage; and a driver configured to receive the first signal and generate a second signal based at least in part on the first signal, the driver being further configured to output the second signal to a gate terminal of a transistor, the transistor including a source terminal coupled to the driver and a first resistor, the transistor further including a drain terminal coupled to the one or more light emitting diodes and an output capacitor connected to the cathode of the diode.

The utility model, which relates to the technical field of the LED, discloses a leakage protection circuit comprising a power supply circuit, a step-down circuit, an LED circuit and a detection circuit. The input end of the power supply circuit is connected to the output pin of the power supply end, the output end of the power supply circuit is connected with the input end of the step-down circuit and the input end of the LED circuit, and the power supply circuit is used for rectifying the output power supply of the power supply end so as to output the power supply to the step-down circuit and the LED circuit; the output end of the step-down circuit is connected with the detection circuit, and the step-down circuit is used for carrying out step-down processing on the power supply output by the power circuit to output reference voltage to the detection circuit; and the detection circuit is respectively connected with the output pins of the power supply end and the LED circuit, and is used for controlling the working state of the LED circuit according to the real-time voltage difference and the real-time voltage between the output pins of the power supply end and the reference voltage output by the step-down circuit. According to the utility model, the working state of the LED circuit can be controlled according to the real-time voltage difference, the real-time voltage and the reference voltage, thereby realizing anti-creeping protection.

The invention relates to the technical field of servers, and discloses a control circuit of an indication module, the indication module and a server, the control circuit comprises a first switch circuit, a second switch circuit, a linear power supply and a switch control module, after power-on, when the switch control module receives a first control signal, a microcontroller does not enable the linear power supply, and when the first control signal is received, the microcontroller does not enable the linear power supply; the first switching circuit is switched on, the second switching circuit is switched off, the first LED lamp is turned on, and the first LED lamp is used for indicating the running state of one target module; after power-on, when the switch control module receives a second control signal, the microcontroller enables the linear power supply, the first switch circuit to be turned off, the second switch circuit to be turned on and the second LED lamp to be turned on, and the second LED lamp is used for indicating the operation state of another target module, so that the two LED lamps can reuse one GPIO port, and the service life of the target module can be prolonged under the condition that the number of used GPIOs is reduced. And the operation health condition of the target module of the server is clearly and effectively indicated.

A method for controlling the power supply of an LED lamp is provided. The method includes following steps: issuing a plurality of pulses in a detection mode to determine whether a user touching state, in which a foreign external impedance is electrically connected to the LED lamp, is detected; entering a normal lighting mode if the user touching state is not detected and generating a driving signal provided, through a power loop, to an LED module of the LED lamp; sampling the driving signal to determine whether an overvoltage protection (OVP) condition is detected during the normal lighting mode; and limiting the amount of current flowing through the power loop by controlling the on / off state of a power switch electrically connected to the power loop if either the user touching state or the OVP condition is detected.

The invention relates to a retrofit Light Emitting Diode, LED, lighting device for connecting to a fluorescent ballast, wherein the retrofit LED lighting device comprises a first end comprising a first power connection and a second power connection for receiving an output power from the fluorescent ballast and comprising a first relay, wherein the first power connection and the second power connection are coupled to a first single connector, wherein the first end is adapted to provide a first output and a second output, a second end comprising a third power connection and a fourth power connection for receiving an output power of the fluorescent ballast and comprising a second relay, wherein the third power connection and the fourth power connection are coupled to a second single connector, wherein the second end is adapted to provide a third output and a fourth output, wherein the first output is coupled to the third output and the second output is coupled to the fourth output, a light emitting diode, LED, load comprising a first set of one or more LEDs coupled to the first output and a second set of one or more LEDs coupled to the second output, wherein the first set of one or more LEDs and the second set of one or more LEDs are coupled in series, wherein the retrofit LED lighting device further comprises the first relay comprising a first relay switch and a first driving coil circuit, wherein the first relay switch is in a series connection between the first power connection or the second power connection and the LED load, and the second relay comprising a third relay switch and a second driving coil circuit, wherein the second relay switch is coupled between the third power connection or the fourth power connection and the LED load, wherein the first driving coil circuit is electrically coupled across the first set of one or more LEDs and the second driving coil circuit is electrically coupled across the second set of one or more LEDs.

The invention, which relates to the technical field of the LED, discloses a leakage protection circuit comprising a power supply circuit, a step-down circuit, an LED circuit and a detection circuit. The input end of the power supply circuit is connected to the output pin of the power supply end, the output end of the power supply circuit is connected with the input end of the step-down circuit and the input end of the LED circuit, and the power supply circuit is used for rectifying the output power supply of the power supply end so as to output the power supply to the step-down circuit and the LED circuit; the output end of the step-down circuit is connected with the detection circuit, and the step-down circuit is used for carrying out step-down processing on the power supply output by the power circuit to output reference voltage to the detection circuit; and the detection circuit is respectively connected with the output pins of the power supply end and the LED circuit, and is used for controlling the working state of the LED circuit according to the real-time voltage difference between the output pins of the power supply end and the reference voltage output by the step-down circuit. According to the invention, the working state of the LED circuit can be controlled according to the real-time voltage difference and the reference voltage, so that anti-creeping protection is realized.

The present application relates to a pixel driving circuit, a pixel driving method, and a display panel. The pixel driving circuit includes: a current driving circuit, configured to receive a display data signal and a display control signal, and output a driving current corresponding to the intensity of the display data signal when the display control signal is received; a gray scale control circuit, configured to receive the driving current, a pulse width selection signal, and a pulse width modulation signal, and drive a light emitting element for a preset duration according to the pulse width modulation signal; wherein the preset duration is a first duration, a second duration, or a third duration corresponding to the pulse width selection signal. Thus, the light emitting element can also not be in a low current state when displaying a gray scale, avoiding the phenomenon of screen flicker during low gray scale display, and improving the display effect of the display panel at high and low gray scales. In addition, since the pixel driving circuit can drive the light emitting element with three durations, the voltage gradient between gray scales is increased, and the display effect is better.

A bidirectional colorful light triggered by power-line pulse signals connected in series and parallel includes a bidirectional luminous light string triggered by power-line pulse signals, a first controllable switch, a second controllable switch, a third controllable switch, and a fourth controllable switch. The bidirectional luminous light string triggered by power-line pulse signals comprises a plurality of bidirectional light sources, which comprises a light module triggered by power-line pulse signals and a reverse light module. The light module triggered by power-line pulse signals comprises an LED colorful light group and an LED driver that drives the LED colorful light group based on power-line pulse signals loaded on power lines of the bidirectional luminous light string triggered by power-line pulse signals. This invention achieves a bidirectional colorful light driven by power-line pulse signals through the control of the second and fourth controllable switches, simplifying the control circuit.

System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current generator configured to generate a first current flowing through one or more light emitting diodes. The one or more light emitting diodes are configured to receive a rectified voltage generated by a rectifying bridge coupled to a TRIAC dimmer. Additionally, the system includes a bleeder configured to receive the rectified voltage, and a controller configured to receive a sensing voltage from the current generator and output a control signal to the bleeder. The sensing voltage indicates a magnitude of the first current.

An LED lighting device or LED lamp comprising one or more LED packages; and a switch control unit is provided. The switch control unit is configured to operate the one or more LED packages. The switch control unit is in communication with a sensor located in a space, the LED lighting device or LED lamp also being located in the space. The switch control unit is configured to (i) receive a sensor signal from the sensor, (ii) process the sensor signal, (iii) determine an adjustment to the operating light qualities of the LED lighting device or LED lamp based on the processing of the sensor signal and one or more goal light qualities corresponding to the space, and (iv) adjust the operation of the one or more LED packages in accordance with the adjustment.

An apparatus for retrofitting an HID lighting system includes using existing components of a previously installed HID lighting system, such as a ballast thereof, while replacing some capacitors to regulate the power supplied to the retrofit LED lighting fixture. The unused ballast driver is removed and the independent ballast driver assembly is installed into the electronic control housing of the previously installed lighting system. Some retrofit LED lighting fixtures include upward illumination lenses, optics, or diffusers for providing upward illumination. The aiming support and the aiming plate can be used for setting the horizontal aiming angle of the lamp.