1300results 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.

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.

An LED lamp, an integrated circuit and a power supply module thereof are provided. The LED lamp includes and LED module, two end caps, two rectifying circuits, a pi filter circuit, a conversion circuit, a control circuit, a mode switching circuit, and a mode determining circuit. Each end cap has two conductive pins for receiving an external power, and at least one pin is set to a floating state. The control circuit can temporarily cause a current path to be conducted according to a signal received from a first pin, detect whether the LED lamp is properly connected according to signal received from a second pin, and output a control signal through a third pin after the LED lamp is determined to be properly connected such that the conversion circuit generates the driving signal with a steady current which makes the LED module emitting steady light.

The invention discloses a short-circuit protection circuit, an array substrate, a display device and a short-circuit protection method, and relates to the technical field of display. The disclosed short-circuit protection circuit comprises a short-circuit detection module and a short-circuit processing module; the short circuit detection module converts the current loop current on the OLED device into a target detection voltage and outputs the target detection voltage to the short circuit processing module; the short circuit processing module compares the target detection voltage with a preset reference voltage; the short circuit processing module judges that the OLED device is in a short circuit state when the target detection voltage is greater than the preset reference voltage; and when the OLED device is in a short-circuit state, the short-circuit processing module disconnects the loop where the OLED device is located in the OLED driving module. According to the invention, accurate detection of the short circuit of the OLED device is realized through a voltage comparison mode, so that the OLED device can be timely disconnected when the OLED device is short-circuited, and the potential safety hazard is effectively reduced.

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.

A lighting device having resettable over-current protection function includes a light source module, a power supplying module, a DC-to-DC converting module, an over-current short-circuit protection module, a reference voltage generating module and a self-locking protection module. The power supplying module generates an input voltage. The DC-to-DC converting module converts the input voltage into a driving voltage to drive the light source module. The over-current short-circuit protection module generates a voltage detecting by detecting a driving current passing through the light source module. The reference voltage generating module generates a reference voltage according to the input voltage and the voltage detecting signal. The self-locking protection module generates a control signal according to the input voltage and the reference voltage to turn off the over-current short-circuit protection module in order to perform a self-locking protection mode, such that the DC-to-DC converting module is disconnected from the light source module.

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.

The invention discloses an LED open circuit protection control system and a control method thereof. The circuit comprises a logic control module, a constant turn-on time module, a driving module, an NMOS tube MN1, an NMOS tube MN2, an inductor L, a current sampling resistor Rsense, a capacitor C2, an operational amplifier OP2, an error amplifier EA, a comparator CMP1, a loop compensation network, a switch S1, a filter network, a selector MUX, an operational amplifier OP1, a PMOS tube MP1, a minimum turn-off time detection circuit, an output overvoltage detection circuit, an AND gate AND1 and a phase inverter INV1. When the output LED is in an open circuit, the output voltage of the error amplifier EA is clamped at a proper voltage value required by normal operation of the system, so that the problem of inductive current peak during fault removal in the prior art is solved, and the reliability of the system is improved.

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 present application relates to a pixel driving circuit and a pixel driving system. The circuit receives input signals, which comprise a slope signal, a grayscale voltage, a sampling signal and a reference signal. The circuit comprises: a first switch unit, which is configured to sample a grayscale voltage according to a sampling signal, and store the sampled grayscale voltage in a capacitor component; the capacitor component, which is configured to store the sampled grayscale voltage sampled by the first switch unit; a comparison component, which is configured to compare a slope signal with the sampled grayscale voltage, and generate a pulse width modulation signal according to a comparison result; and a display component, which adjusts light emission brightness on the basis of the pulse width modulation signal. Thus, the strict frequency and time sequence requirements of a control signal in a digital driving mode can be avoided, and the phenomena of pitting and non-uniformity in an analog driving mode can be solved.

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.

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.

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.

A display driving circuit includes a first transistor, a storage subcircuit, a compensation subcircuit, a data writing subcircuit, a light-emitting control subcircuit and a reverse bias subcircuit. The storage subcircuit is connected to a control terminal of the first transistor through a first node and to the first transistor through a second node. The compensation subcircuit is connected to a first light-emitting control line, the first transistor and a power supply high-voltage terminal. The data writing subcircuit is connected to a data line, a scan line and the first node. The light-emitting control subcircuit is connected to a second light-emitting control line, a second node and an anode of the display light-emitting subcircuit, a cathode of the display light-emitting subcircuit is connected to the scan line. The reverse bias subcircuit is connected to the scan line, a third node and the power supply high-voltage terminal.

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 utility model relates to the technical field of skin phototherapy, and particularly discloses an OLED red light beauty instrument, which comprises a main body, the main body comprises a base and a frame body assembly arranged on the base, the frame body assembly comprises a mounting cavity and a support plate arranged outside the mounting cavity, a red light source assembly is arranged in the mounting cavity, and the support plate is arranged outside the mounting cavity. The red light source assembly comprises area light source parts, the area light source parts are OLEDs, the supporting plate is provided with a light-transmitting window, the light-transmitting window is provided with covering parts, and the covering parts are arranged on the outer sides of the area light source parts and correspondingly arranged on the peripheral edges of the area light source parts. The OLED red light beauty instrument provided by the utility model is more uniform in light emission, does not generate harmful ultraviolet radiation, is high in safety, and effectively improves the beauty effect.