42results about How to "Precise Brightness Control" patented technology

There is provided a lighting device that can reduce the occurrence of both color irregularity and brightness irregularity of light to be irradiated onto an irradiation surface even if one of a plurality of light-emitting elements included in light sources fails to light properly, and a display device using this lighting device. The lighting device includes a plurality of light sources (8), each having a plurality of light-emitting elements (26) of different luminescent colors, arranged on a plane, and can control color and luminance of light to be irradiated from the light sources (8) by controlling brightness of each of the light-emitting elements (26) based on a light source driving signal. The device includes: a lighting failure detecting portion (23) that detects which of the light-emitting elements (26) fails to light properly; an emission correction determining portion (34) that determines the necessity of brightness correction for the light-emitting elements (26) other than the light emitting element (26) that fails to light properly, based on a level of the brightness instructed for the light-emitting element (26) that fails to light properly by the light source driving signal; and an emission correcting portion (35) that performs the brightness correction for the other light-emitting elements in accordance with the determination made by the emission correction determining portion (34).

The invention discloses an intelligent LED (light-emitting diode) video synchronizing impulse stroboscopic supplemental lighting device. The device is composed of an electronic circuit and a shell, wherein the electronic circuit has the following structure: a 220V alternating current is connected with a 24V switching power supply and a synchronization generator, the 24V switching power supply is connected with an LED lamp matrix and a +12V power supply circuit, the +12V power supply circuit is connected with a +5V power supply circuit, a light ray detection circuit is connected with a signal processing circuit, a signal input circuit is connected with the signal processing circuit, the signal processing circuit is connected with a signal output circuit, and the signal output circuit is connected with the LED lamp matrix through an actuator. With the adoption of the device provided by the invention, the phenomena of dazzling, uneven exposure and streaking can be effectively avoided, the synchronous exposure with a frame of a camera and frequency multiplication output of light can be realized, and the problem that the color of the red light in an image shot by a monitoring camera changes from red to yellow during the red light signal of traffic lights is solved.

The invention relates to a human face perception-based steady-state visual evoked potential brain-computer interface method. The method is technically characterized by comprising the steps of recording an electroencephalogram signal of a user by using an electroencephalogram collection device, and transmitting the electroencephalogram signal to a calculation computer in real time; adopting a humanface perception coding method as a steady-state visual evoked potential evoking mode by a stimulation computer and generating a stimulation sequence; according to the stimulation sequence, generatingmultiple different stimulation frequencies, and performing coding by using the stimulation frequencies to obtain multiple different target blocks; preprocessing the obtained electroencephalogram signal by the calculation computer, and performing frequency identification on the preprocessed electroencephalogram signal by adopting an electroencephalogram decoding algorithm; and outputting a controlcommand corresponding to an identified frequency component to a feedback computer. According to the method, human face information of happy expressions is introduced in visual stimulation, so that the user visual attention can be enhanced, the signal-to-noise ratio of an evoked response is increased, the performance of a steady-state visual evoked potential brain-computer interface is improved, and a foundation is laid for promoting a practical process of the brain-computer interface.

The invention discloses an AOI (Automated Optical Inspection) digital LED (Light-Emitting Diode) light source controller which comprises a display module, a driving module, a light sensor, a feedback unit and a dimming control unit, wherein the display module is used for displaying an LED light source channel number and a corresponding light source brightness value; the driving module is used for driving light sources so as to enable a plurality of LED light sources to be sequentially switched on; the light sensor is used for receiving light from the LED light sources which are sequentially switched on; the feedback unit is used for generating a plurality of feedback signals on the basis of light receiving signals which are obtained from the LED light sources by the light sensor; and the dimming control unit is used for receiving the plurality of feedback signals and generating a plurality of PWM (Pulse Width Modulation) signals to control the driving module so as to respectively regulate the light emitting quantities of running LEDs. The invention also provides an AOI digital LED light source control method. According to the invention, a PWM constant-current dimming manner is adopted; in the PWM dimming process, forward current conduction time is changed by switching on and switching off the LEDs so as to achieve a brightness regulating effect, ensure sufficient integral brightness and generate more excellent contrast between a feature which needs to be observed and an image feature which needs to be ignored.

The invention discloses a dimming circuit and a dimming method for an LED light supplementing lamp. An input end of a reference voltage module in the dimming circuit is connected with a power source, an output end of the reference voltage module is connected with a voltage sampling circuit, an amplifier and a single chip microcomputer, an output end of the voltage sampling circuit is connected with the amplifier, an output end of the amplifier is connected with the single chip microcomputer, the single chip microcomputer is connected with a constant-current driving circuit, and the constant-current driving circuit is in drive connection with an LED. The dimming method includes steps of (1), acquiring a reference voltage source via the reference voltage module; (2), matching a potentiometer with a divider resistor to sample signals; (3), enabling an operational amplifier circuit to process the signals so as to remove interference signals; (4), enabling the single chip microcomputer to complete high-precision A/D (analog/digital) conversion to obtain digital signals; (5), processing the digital signals to obtain digital PWM (pulse-width modulation) signals; and (6), adjusting the constant-current driving circuit by the digital PWM signals to control brightness variation of the LED. According to the dimming scheme, the dimming circuit and the dimming method have the advantages of high dimming precision, accurate brightness control, few required peripheral devices and the like.

The embodiment of the invention provides a brightness control method and terminal equipment. The method comprises the steps that if it is determined that switching from a first mode to a second mode is needed, the brightness of a first area of a screen of the terminal device is adjusted from first brightness to second brightness, the first brightness is the brightness of the first area in the first mode, and the first brightness and the second brightness are different; And after entering the second mode, setting the brightness of a second area of the screen as third brightness, and after entering the second mode, setting the brightness of the first area as the second brightness. According to the embodiment of the invention, the display performance of the terminal equipment can be improved.

The invention discloses an error compensation device and an error compensation method, and the error compensation device is used for the alignment and fitting of a display panel, and comprises a register, a pattern generator, a sensor, and an address burner. Each pixel in a first substrate and a second substrate is endowed with a coordinate; and the plurality of pixels in the first substrate and the second substrate are lightened to generate the first graphic mark and the second graphic mark, and the position difference between the coordinate position of one point in the first graphic mark andthe position of the corresponding point in the second graphic mark is calculated and compensated, so that the deviation caused by full lamination can be avoided, and the pixel-level brightness control is more accurate.

The invention discloses a piece of intelligent glass. The intelligent glass mainly comprises an external frame type structure, a thin film solar panel, at least two polaroids, a movable device, an electricity storage device, a load unit and a control unit. The external frame type structure is used for containing all the components, the glass is arranged in the external frame type structure and used for transmitting light and protecting a middle unit, the thin film solar panel is arranged on one face of the glass so as to collect electric energy generated by light, the two polaroids are arranged between two pieces of glass, one polaroid is fixed, the other polaroid is controlled through the movable device so as to adjust the relative positions of the two polaroids and generate the transmitting or shading effect, the electricity storage device is arranged on one side of the external frame type structure, and used for storing electric power converted by a solar panel, and the load unit is arranged at the bottom of the external frame type structure and conducts illumination by the electric power provided by the electricity storage device. The control unit is arranged on one side of the external frame type structure and used for controlling the opening and closing of an illuminant or the activity of the movable device.

The invention discloses a light-emitting assembly and a light-emitting module. The light-emitting assembly comprises a signal conversion module and a light-emitting unit. The light-emitting unit comprises a first switch module, a light-emitting element and a second switch module, the first end of the first switch module is connected with the signal conversion module, and the second end of the first switch module is connected with the first power supply end; the light-emitting assembly and the second switch module which are connected in series are arranged between the third end of the first switch module and the second power supply end; the signal conversion module is used for converting a target display signal representing image information of a to-be-displayed image block corresponding tothe light emitting unit into a first display signal; wherein the first display signal is used for controlling the third end of the first switch module to output a second display signal in a pulse width modulation form corresponding to the first display signal, and the second display signal is used for controlling the brightness of the light-emitting element under the condition that the scanning end controls the second switch module to be in an on state. The accuracy of brightness control of a light-emitting element can be improved.

The invention discloses a shooting adjustment method and device, electronic equipment and a storage medium. The method comprises the following steps: identifying a face area in a shooting area; determining a compensation area corresponding to the face area according to the proportion of the face area to the shooting area; focusing each area according to the weight coefficient of each area in a focusing area list, and adjusting the brightness of each area according to the weight coefficient of each area in a photometric area list so as to shoot the shooting area, the focusing area list and thephotometric area list respectively comprising a face area and a compensation area. According to the embodiment of the invention, precise focusing of the focusing area is realized, and precise controlof brightness adjustment of the shooting area is realized, so that the definition and brightness of the face area are ensured, the overall visual effect of the shooting area is improved, and the use experience of a user is improved.

The invention discloses a light-emitting assembly and a light-emitting module. The light-emitting module comprises light-emitting assemblies arranged in an array mode, and each light-emitting assemblycomprises a signal conversion module, a light-emitting element and a switch module, wherein the light-emitting element and the switch module which are connected in series are arranged between the first power supply end and the second power supply end; the signal conversion module is connected with the switch module, and the signal conversion module is used for converting a target display signal into a display signal in a pulse width modulation form; the display signal in the pulse width modulation form is used for controlling the on-off state of the switch module so as to control the brightness of the light-emitting element; the target display signal is used for representing image information of the to-be-displayed image block corresponding to the light-emitting assembly. According to thelight-emitting component and the light-emitting module provided by the embodiment of the invention, the accuracy of controlling the brightness of the light-emitting component can be improved.

The invention discloses a display control method, a display control device and a display device. The display control method comprises the steps: selecting a selected area surrounding a first display area from a second display area; dividing the selected area into a first sub-area and a second sub-area, wherein the boundary of the first sub-area and the second sub-area is a preset curve; selectingsecond target sub-pixels from the sub-pixels of the first sub-area, so that a second light-emitting combination unit formed by the second target sub-pixels is the same as a first light-emitting combination unit formed by the first target sub-pixels of the first display area; and controlling other areas except the selected area in the second display area to be displayed in a first display mode, controlling the selected area and the first display area to be displayed in a second display mode, and controlling other sub-pixels except the second target sub-pixels in the first sub-area to be alwaysin a non-light-emitting state. According to the embodiment of the invention, an abrupt boundary line in the first display area can be avoided.

The invention discloses a field of view programmable microscope device. The field of view programmable microscope device comprises a PC, a control circuit, a light source, an optical filter, a uniform light bar, a prism lens set, a digital micromirror device, a lens array, a sample object table and a camera, wherein the light source is controlled by the PC for generating white light, special-wavelength light is generated from light through the optical filter, the point light source is expanded to be a plane light source to irradiate to the digital micromirror device through the light bar and the prism lens set, each mirror switch is controlled by the digital micromirror device for generating modulation light having different levels of brightness, shapes, regions, wavelengths, continuity time and scanning frequencies, to-be-detected samples are irradiated through the lens array, after images are acquired by the camera, the images are stored and displayed on the PC, and feedback adjustment is further realized. The device is advantaged in that accurate control on brightness, shape and wavelength of the light source can be realized, and the microscopic sample information is displayed or stored in the PC. Compared with a traditional microscope, a modulation mode and a scanning speed of space light can be freely controlled, the information can be displayed and stored, and high flexibility is realized.

The invention discloses a screening device for screening the non-uniformity of a backlight source and a testing method of the screening device. The screening device comprises a liquid crystal screen (1), a structural part (2) and a diffusion plate (3), wherein the structural part (2) is provided with a screen framework for mounting the liquid crystal screen (1) and a plate framework for mounting the diffusion plate (3); the section of an inner cavity of the structural part (2) is rectangular and a backlight framework (6) is mounted in the inner cavity of the structural part (2); a backlight source (5) is fixedly mounted on the backlight framework (6); one side of the backlight framework (6), which is provided with the backlight source (5), is placed towards the diffusion plate (3); a circuit board (8) with a debugging wire is mounted on the backlight source (5); and the diffusion plate (3) is mounted between the liquid crystal screen (1) and the backlight source (5). The screening device provided by the invention is used for screening the non-uniformity of the backlight source before the backlight source is mounted on a liquid crystal module, thereby assuring the non-uniformity of the liquid crystal module through assuring the non-uniformity of the backlight source which is mounted in the liquid crystal module.

Embodiments of the invention provide an FED (Field Emission Display) pixel driver, an FED display panel and a display device, and relate to the technical field of display. The FED pixel driver comprises a cathode, a drive module, and a modulation and demodulation module. The drive module is connected with the modulation and demodulation module, and is used for providing an opening or closing signal under the control of the modulation and demodulation module. The drive module is further connected with a reference potential input end used for providing reference potential, the cathode, and a grounding end, and is used for driving electrons of the cathode to escape and generate constant emission current in the open state under the control of the reference potential input end and the grounding end. The FED pixel driver, the FED display panel and the display device are used in display.

The invention discloses a kitchen ventilator cooking fume recognition method and a kitchen ventilator. The method comprises the steps that an image collecting device is used for obtaining the currentlight ray state, light sensitization parameters of the image collecting device are adjusted, and imaging parameter information of the image collecting device is in the imaging parameter information value range in the standard light ray state; the image collecting device is used for obtaining target image information, and the obtained target image information is compared with preset image datum information; the imaging brightness information of the kitchen ventilator and/or the target image attribute information are/is adjusted, and the target image information is in the preset image datum information value range; and according to the adjusted target image information, the cooking fume amount information corresponding to a target image is determined.