133results about How to "Improve dynamic contrast" patented technology

An integrated radiopharmaceutical patient treatment system is disclosed including a patient support platform with an associated patient stimulus apparatus, an imager proximate the patient support platform, a radiopharmaceutical fluid delivery system for infusing a radiopharmaceutical fluid into a patient, a patient monitor to be associated with a patient, and an integrated system controller operably associated with the patient stimulus apparatus, imager, radiopharmaceutical fluid delivery system, and patient monitor to control and coordinate their operations. Within the patient treatment system the radiopharmaceutical fluid delivery system may be included comprising a radionuclide supply module, a radiopharmaceutical processing module, a quality control module, a patient injection module, and a controller. A hazardous fluid handling system including a docking station and a hazardous fluid transport device adapted to detachably dock with the docking station is further disclosed.

An apparatus and method for displaying large format images, graphics, and videos. The apparatus comprise a layer of column oriented optical fibers, each fiber is illuminated at one end by at least one laser diode, and a second layer which sits in front of the first layer and is parallel to the first layer, whose projected area substantially overlap that of the first layer. The second layer comprises a plurality of optical fibers arranged in rows. In between the first and second layer sits a third layer of optical switching elements. Alternatively, the second layer can be a light diffusing layer. Laser lights emitted from the laser diodes travel in parallel along respective column fiber until they are redirected by optical switching elements which couple the laser lights within the column fibers to the row fibers or to the difflusing layer directly whereby they are scattered by the diffusing elements to reach the viewing audience. The small size of the fibers results in very small fill factor, allowing light absorbing matrix and backing layer to absorb ambient light effectively. The contrast ratio under ambient light condition is further enhanced by the use of multilayer dielectric optical filter to preferentially absorb ambient light.

The invention relates to a light-emitting control method for adopting and controlling liquid crystals to emit light from independent light sources for displaying characters, in particular to a dynamic backlight control method for an LED display panel. The control method comprises the following steps: setting at least one control point between two preset fixed threshold values of the average brightness of the full screen, and forming a regulation curve corresponding to backlight brightness between the control point and each of the two fixed threshold values to be used as a reference for backlight regulation; computing the weighted average of the previously computed average brightness value and the subsequently computed average brightness value to acquire the average brightness value of the full screen of the current frame image; and correspondingly regulating the backlight brightness according to the backlight brightness value corresponding to the average brightness value on the regulation curve used as the reference for backlight regulation. Thus, the invention provides a method for dynamically regulating backlight brightness, which overcomes the defect of light leakage of the inherent dark gray scale in liquid crystal display and structure coordination, increases the dynamic contrast, improves the image quality, and realizes the purposes of energy saving and environmental protection.

A display device includes a display panel assembly having a plurality of pixels arranged in rows and columns and a backlight unit disposed behind the display panel assembly and having a plurality of pixels arranged in rows and columns. The number of the pixels of the backlight unit is less than a number of the pixels of the display panel assembly. The backlight unit includes a plurality of scan electrodes arranged along one of row and column directions and a plurality of data electrodes arranged along the other of the row and column directions; and the pixels of the backlight unit are adapted to emit lights having intensities in accordance with gray levels of the pixels of the display panel assembly.

The invention provides a liquid crystal display brightness control method and device and a liquid crystal display device, and belongs to the technical field of liquid crystal display. The method is characterized by, determining gray-scale values of images in subregion image data blocks according to a preset rule and on the basis of the received image signals, and pre-extracting subregion backlight values corresponding to the subregion image data according to the gray-scale values of the images; multiplying a preset backlight value gain coefficient with the pre-extracted subregion backlight values to obtain subregion backlight values of backlight subregions obtained after gaining, wherein the preset backlight value gain coefficient is larger than 1; and mapping the subregion backlight values obtained after gaining to drive circuits of backlight sources of the corresponding backlight subregions respectively to drive and control the brightness of the backlight sources of the corresponding backlight subregions. Therefore, liquid crystal display frame contrast image quality effect is improved.

The invention discloses a method and a system for dynamic backlight local control liquid crystal display. The method comprises the following steps of: inputting video signal images; calculating pixel luminance of the input images; calculating local luminance representative values of the input images; calculating backlight local control values on the basis of the local luminance representative values of the images and backlight distribution characteristics; calculating backlight luminance values on the basis of the backlight local control values and the backlight distribution characteristics; compensating the input images on the basis of the backlight luminance values; outputting the backlight local control values to control the backlight luminance; and outputting the compensated video signal images. According to the method and the system, the power consumption of liquid crystal display devices can be reduced to a great extent; the dynamic contrast and the static contrast of the displayed images are improved to display in a high dynamic range; the color saturation is high, and colors have high fidelity; and the image detail expressive capability of the images is obviously improved. In addition, according to the method and the system, the problem of image quality brought by dynamic backlight liquid crystal display is effectively solved, inter-frame flicking is inhibited, and image artifact is prevented.

The invention relates to a driving method, compensation processor and driver device for liquid crystal display. The driving method includes steps of receiving data signal of a present frame; obtaining an average brightness value of the present frame; comparing the previous frame with the present frame, and when the difference between the average brightness values is larger than or equal to a set threshold, generating at least two back light driver pulse signals of which the duty ratios gradually changing, and outputting them to drive the back lights. The compensation processor includes a data analysis module, a data compensation module, a back light linear filtering module and a pulse generator module. The driver device employs the compensation processor of the present invention. The present invention employs the technical means of generating a plurality of back light driver pulse signals, realizes the gradual changing of the brightness of the back lights, and overcomes the picture flickering problem due to the sudden changing of the brightness of the back lights, thus improving the display effect of the LCD.

The invention discloses a display device and a driving method thereof. The display device comprises a side-entry backlight, a liquid crystal display panel at the light outgoing side of the backlight, and a light control part positioned between the backlight and the liquid crystal display panel. The side-entry backlight comprises a light guide plate and multiple light emitting diodes arranged on a side edge of the light guide plate. The light guide plate is divided into multiple first areas, and the brightness of each area is controlled by at least one light emitting diode. The light control part is divided into multiple second areas, and at least one second area is covered by one first area. The brightness of each first area and the light transmittance of each second area are controlled by a display frame needed by a relative area of the liquid crystal display panel. Through adoption of the side-entry backlight, the display device becomes ultrathin. Moreover, the brightness of each first area and the light transmittance of each second area covered by one corresponding first area are controlled on the basis of the needed display frame, so a high dynamic contrast can be realized. Therefore, the display device that is ultrathin and exhibits a high dynamic contrast is obtained.

The invention provides a direct-type backlight unit and a driving method thereof and a liquid crystal display device, and relates to the technical field of display. The direct-type backlight unit is used for improving the contrast ratio of an image displayed by a liquid crystal panel and preventing the occurrence of a motion blur phenomenon. The direct-type backlight unit comprises a baseboard, multiple driving units arranged on the baseboard and multiple light-emitting elements arranged on the baseboard, wherein each driving unit is correspondingly connected with one light-emitting element, and the driving units are used for controlling the light-emitting duration and the light-emitting luminance of the corresponding light-emitting elements. The direct-type backlight unit is used for providing backlight for the liquid crystal panel.

A light emission device and display device utilizing the light emission device are provided. The light emission device includes first and second substrates facing each other. Cathode electrodes are arranged on an inner surface of the first substrate. Gate electrodes are arranged above and crossing the cathode electrodes. The gate electrodes have a plurality of openings at crossing regions of the gate electrodes and the cathode electrodes. Electron emission regions are formed on the cathode electrodes in the plurality of openings. A light emission unit is provided on an inner surface of the second substrate. At least one of the electron emission regions is located off of a center of a corresponding one of the plurality of openings.

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.

The invention provides a projection display method, which can perform dynamic adjustment to projection display contrast according to brightness of the image signal, comprising steps: receiving a image signal; analyzing brightness of the image signal; computing optimal modified value of brightness and modifying the image signal according to the optimal modified value; computing light source brightness correction value and adjusting brightness of the projection light source according to the light source brightness correction value. The projection display method of the invention adjusts brightness of the projection light source according to color greyscales of the projection displayed image, which also corrects the image in order to ensure that greyscale of the image will not be reduced following the brightness reduction of the light source, thereby lowering power consumption and improving dynamic contrast.

The invention discloses a method for adjusting the dynamic contrast of a digital image or video. The method comprises the following steps that a frame of image in the digital image or video is read; a pixel brightness value probability cumulative distribution function cdf() of the image is calculated; when the image is a gray level image, the contrast of the current gray level image is adjusted with a relational expression (please see the specific formula in the specification); when the image is a color image, the contrast of the current color image is adjusted with a relational expression (please see the specific formula in the specification), wherein zi=f(Ei), zi is the output pixel value of a pixel point at exposure brightness Ei, f() is a mapping function, Yi is a brightness value, and Ci is one channel in RGB three color channels. The invention further discloses a system for adjusting the dynamic contrast of the digital image or video.

The invention discloses a backlight module group and a liquid crystal display thereof. The backlight module group comprises a plurality of layers of light guide plates, a plurality of rows of LED light bars, and a controller. Every layer of the light guide plate is divided into a plurality of first backlight areas, which are provided with screen dots, and the screen dots of any two adjacent layers of the light guide plates are in a staggered arrangement. A plurality of rows of LED light bars are disposed on the side surfaces of the light guide plates, and every row of the LED light bars is disposed on the side surface of the corresponding light guide plate. Every row of the LED light bars is divided into a plurality of second backlight areas, which are opposite to the first backlight areas. The controller is used to control the light emitting of the LED light bars. The HDR effect of the lateral entrance type backlight module group is effectively improved, and a problem of conventional lateral entrance type backlight module groups of inability of realizing multi-subarea local dimming is solved; effective light isolation is realized, and the lights of the adjacent first backlight areas are prevented from mutual disturbance, and a light emitting effect is further improved.

Gray scale distribution of an input image signal is obtained through statistics to determine the contrast characteristic of the input image signal. Based on the gray scale distribution, by a look up table, corresponding gamma setting values are derived and stored in a register. The register outputs the stored gamma setting values to a gray scale voltage generation circuit to adjust the gray scale voltage. Therefore, the display contrast and display quality are improved.

The invention discloses a laser projector for optimizing dynamic contrast of projection images. The projector comprises that an image processing board is connected to a system control board, converts the image information input by a signal source into standard TTL signals, carries out stretching, scaling, edge processing and illumination compensation to the signals and sends the processed signals to the system control board; the system control board is connected to a projection chip and a laser light source, carries out pre-projection processing to the image color information in the received signals, controls the current of the laser light source and sends a control instruction to the projection chip; the laser light source is connected to the projection chip and sends light signals to the projection chip; and the projection chip reflects out the received light signals according to the instruction sent by the system control board so as to form projection. According to the projector of the invention, the real time black field of the laser projector is improved and the dynamic contrast of the projection images is optimized through adjusting the current of the laser light source.

The invention discloses a lateral backlight module, a display and light guide plates. The lateral backlight module comprises at least two stacked light guide plates, each light guide plate comprises a light emergent surface, a bottom surface and at least one light incident surface, and the bottom surface of the upper light guide plate is opposite to the light emergent surface of the lower light guide plate; light sources are arranged at the light incidence surface of each light guide plate and independent of one another; light emergent zones and total reflection zones are alternately arranged on each light guide plate in the light ray spreading direction of the light sources, and light emitted by the light sources is totally reflected in the total reflection zones; the light emergent zones of each light guide plate of the at least two light guide plates correspond to the total reflection zones of the adjacent light guide plate. With the adoption of the light guide plate structures, the display subzones of the lateral backlight module can be increased, and the dynamic contrast ratio of the lateral backlight module can be increased.

A light emission device and a display device using the light emission device as a light source are provided. The light emission device includes first and second substrates facing each other, an electron emission unit located on an inner surface of the first substrate, a phosphor layer located on an inner surface of the second substrate and adapted to be excited by electrons emitted from the electron emission unit, an anode electrode located on the phosphor layer, a heat dissipation plate located at a side of the first substrate, and a thermal diffuser plate located on the second substrate and thermally coupled to the heat dissipation plate. The thermal diffuser plate is configured to transmit light emitted by the phosphor layer.

A block control type backlight system is designed into a plurality of independently controlled light-emitting blocks. Light states of the light-emitting blocks are detected by a single color sensor or a single light sensor. Reference values corresponding to the light-emitting blocks are set according to a white balance value. The reference values and light state information are compared to adjust a tricolored light proportion so as to compensate photochromism and brightness of the light-emitting blocks and an illumination panel. In addition, the states of the light emitted by a plurality of LED modules of a whole face lightening type light source system are detected by the single light sensor. The reference values and the detection results of the light sensor are compared to generate a tricolored light proportion adjustment value so as to compensate the photochromism and the brightness of the light emitted by the LED modules.