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154results about How to "Avoid flickering" patented technology

Non-isolated LED constant-current driver chip, circuit and method

ActiveCN106332390AEliminate start-up resistorsLow costElectric light circuit arrangementCapacitanceHigh resistance
The invention provides a non-isolated LED constant-current driver circuit employing a BUCK framework. The non-isolated LED constant-current driver circuit comprises a high-voltage power supply module for generating DC voltage, a floating current sampling module for sampling current flowing through a power switch tube, and a constant-current driver module for controlling the power switch tube according to the current flowing through the power switch tube to achieve constant-current control on an LED lamp string. By a high-voltage power supply technology, a constant DC power supply is directly generated from a drain end of the power switch tube to provide a chip with electricity, a resisting resistor is omitted, meanwhile, a VCC capacitor can be changed into a low-voltage capacitor with lower cost, the cost of a system is reduced and the complexity of the system is reduced. By a floating sampling technology, a special current sampling pin CS is removed, the driver chip only comprises three pins and cheap encapsulation can be adopted, so that the cost of the chip is greatly reduced. Open circuit protection setting is integrated into the chip, so that the problem of LED twinkling due to the fact that a high-resistance pin ROVP is easily disturbed is solved and the performance is effectively improved.

Human-machine interaction method with vision movement related neural signal as carrier

A human-computer interaction method based on neural signals relative to the visual movement relates to the technical filed of the human-computer interaction, and is characterized in that the method comprises the following steps: connecting a human-computer interaction unit waiting to be chosen with motional elements started at different times; arranging an EEG electrode in visual movement area of the user head for recording EEG signals; separately extracting brain waveforms corresponding to each motional element in a sequence according to the difference of the time starting; detecting whether an N2 electric potential corresponding with the visual movement; detecting that a human-computer interaction unit corresponding with the simulation of the N2 electric potential is considered as a target for a tested person; finishing the corresponding functional module by a computer, so as to realize the human-computer interaction. The testing results by the system shows that the choosing of a target averagely costs 6 seconds, and both the detection rate and the false reject rate meet the requirement of the regular human-computer interaction. The method has the advantages of having no scintillations, hardly causing the visual fatigue, and being suitable for low contrast and low illumination condition, and different human-computer sites.

Synchronous tunnel video display system

The invention provides a synchronous tunnel video display system, which comprises a power supply module, a master server, a human-computer interaction module, a plurality of display modules, a plurality of synchronization modules and a communication module, wherein the master server is used for producing a play image; the plurality of display modules are arranged in a plurality of train running tunnels, and are used for displaying video image information; the plurality of synchronization modules are used for ensuring the synchronization of a train running state and information displayed by the display modules; the communication module transmits data produced by the master server to the display modules; the synchronization module further comprises a plurality of speed testers and a synchronization signal processor; the speed testers are arranged between two metro stations, and are uniformly distributed in the tunnels between the two stations of a train, and when detecting the passage of the train, transmit the information to the synchronization signal processor respectively; the synchronization signal processor performs calculation to obtain a synchronization control signal, transmits the synchronization control signal to the display modules; and the display modules display the video image information according to the instruction of the synchronization control signal. The synchronous tunnel video display system has the advantages of synchronous display capability and high definition.

Touch panel, display device, optical sheet, method for selecting optical sheet, and method for manufacturing optical sheet

ActiveUS20150260882A1Avoid flickeringSuppress reflection of external lightOptical articlesSpecial surfacesPixel densityDisplay device
A touch panel capable of imparting a variety of characteristics such as anti-glare properties and preventing the scintillation of image light in ultrahigh-definition display elements having a pixel density of 300 ppi or more is provided.
The touch panel includes an optical sheet as a component, in which the optical sheet has an uneven shape on a surface, the uneven shape satisfies at least one condition selected from the following (A) to (C), and the touch panel is used for a front surface of a display element having a pixel density of 300 ppi or more,
    • Condition (A); a gap between inclination angles indicating a half value of a peak value of an inclination angle distribution curve of the uneven shape is in a range of 5 degrees to 15 degrees,
    • Condition (B); an inclination angle indicating an inflection point on a positive direction side of the inclination angle indicating the peak value of the inclination angle distribution curve of the uneven shape is in a range of 4 degrees to 15 degrees, and a difference between the inclination angle indicating the inflection point on the positive direction side and the inclination angle indicating the peak value of the inclination angle distribution curve is in a range of 2.2 degrees to 10 degrees, and
    • Condition (C); the inclination angle indicating the peak value of the inclination angle distribution curve of the uneven shape is in a range of 2 degrees to 8 degrees, skewness of the inclination angle distribution curve of the uneven shape is in a range of 0 degrees to 1.5 degrees, and/or kurtosis of the inclination angle distribution curve of the uneven shape is in a range of 1.5 to 6.

LED (Light-Emitting Diode) backlight driving circuit and liquid crystal display

The invention discloses an LED (Light-Emitting Diode) backlight driving circuit, which comprises a step-up circuit, a driving IC (Integrated Circuit), a discharge module and a detection module, wherein the step-up circuit is used for converting input voltage into required output voltage and supplying the output voltage to an LED unit; the driving IC is used for controlling the step-up circuit to enable the step-up circuit to convert the input circuit into the required output voltage and supply the output voltage to the LED unit; the discharge module is used for releasing charges stored in the step-up circuit after the driving circuit is turned off; the detection module is used for detecting the voltage at the output end of the step-up circuit and generating an enable signal which is used for controlling the working state of the driving IC. In the LED backlight driving circuit provided by the invention, when the driving circuit is turned off and then is quickly turned on again, the detection module can detect the discharge situation of the step-up circuit and the driving circuit is turned on only when the charges stored in the step-up circuit are released and the output voltage is enabled to be smaller than reference voltage, so that the phenomenon of flashing is fully avoided. The invention additionally provides a liquid crystal display with the LED backlight driving circuit.

Pixel array and display panel

ActiveCN101762917AVariations in parasitic capacitance are consistentLow costSemiconductor/solid-state device detailsSolid-state devicesElectricityParasitic capacitance
The invention relates to a pixel array which comprises a plurality of scanning lines, a plurality of data lines, a plurality of first pixels and a plurality of second pixels. The first pixels and second pixels are positioned on two opposite sides of the same data line and connected with the same data line; the first pixels are positioned between the adjacent two odd numbers of scanning lines; and the second pixels are positioned between the adjacent two even numbers of scanning lines. The first pixels are electrically connected with odd number of scanning lines; the second pixels are electrically connected with even number of scanning lines; first transistors of the first pixels and second transistors of the second pixels are arranged in such a manner that a drain electrode overlapping region and a grid electrode overlapping region of the first pixels which are corresponding are synchronously reduced or largened, so that the change trends on grid electrode-drain electrode parasitic capacitances of the pixels caused by the change on the drain electrode overlapping region and the grid electrode overlapping region are consistent, thereby avoiding the problem of non-uniform flickering and picture display. In addition, the invention provides a display panel.
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